Grinding or polishing wheel.



No. 879,504. PATENTED FEB. 18, 1908.

C. B. WATTLES.

GRINDING 0R POLISHING WHEEL. j

APPLICATIONAFILED Nov.1s,*19o7.

mig-

UNllTED ATES PATENT OlflEllCE.

1i/ OYRA B. WATTLES, OF PROVIDENCE, RHODE SLAND ASSIGNOR TO SURFAOING MACHINE COMPANY,

GRNDNG pplicatioii tiled November To all whom it may concern:

Be it known that I, Crim B. citizen of the United States, residing at Providence, in the county of Providence and State of Rhode and useful Improvement in Grinding or Polishing Wheels, of which the following is a specification.

rhis invention has reference to an improvement in grinding or polishing wheels having a flexible detachable covering, sucli as paper or cloth having a surface of sand, emery or corundum for grinding or a fabric adapted for polishing. y

The object of my invention is to improve the constiuction of a grinding wheel or roll, whereby a terial is detacliably secured on the peripheral face of the wheel or roll and the slack of the same (caused by the abrasive orl polishing material coming into contact with the work) automatically taken up and positively held by mechanism operated by force' of the revolving wheel or roll.

My invention consists in the peculiar and novel construction of a grinding or polishing wheel or roll having mechanism operated by the centrifugal force of the revolving wheel or roll to automatically take up and positively hold the slack of the abrasive or polishing material secured on the peripheral face of the wheel or roll, said grinding or polishing wheel or roll and automatic take up mechanism having details of construction as will be more fully set forth hereinafter and claimed.

Figure 1 is a face view of my improved grinding or polishing wheel, showing a strip of flexible abrasive material on the peripheral face of the same. ig. 2 is an end view of the wheel, showing the automatic take-up mechanism in the position for receiving the end of the strip of abrasive material in broken lines, in the extreme take-up position in full lines, and the means in the take-up mechanism for positively holding of the abrasive material as it is taken up by mechanism. Fig. 3 is an e view of that portion of the wheel having the the take-up automatic take-up mechanism, showing the the extreme take-up position, and the means for detachably securing the ends of the strip of abrasive material to the wheel rim and to the automatic take-up arged detail Fig. 3 to more fully show the construction of the taketake-up mechanism in 4 is an enl mechanism. Fig. sectional view taken on line Specification of Letters Patent.

Warriors, a tail Island, have invented a. new

l take-up mechanism,

flexible abrasive or polishing mas the centrifugal arged detail end OF PROVlDENCE, RHODE lSLAND, A CORPORATlON OF RHODE ISLAND.

GR POLSHNG WHEEL.

Patented Feb. 18, 1908.

18.1907. Serial No. 402.573.

up mechanism, and Fig. 5 is an enlarged .de-

end view similar to Fig. 3. showing a modified form of take-up mechanism.

ln the drawings wheel in the forni of a pulley, c an automatic and d a strip of flexible abrasive material detachably secured on the peripheral face of the wheel by attaching one end to the wheel rim and the other end to the automatic take-up mechanism c. The shaft a is rotatably supported in suitable bearings (not shown) and is revolved at a high rate of any well known means.

The wheel b is constructed to have a. central hub 6 secured to the shaft a. an annular rim 7 in the peripheral face of which is a narrow transverse slot 8 parallel with the shaft a, an under thickened portion 9 at one edge of the slot S and having a transverse tubular hole 10 and a narrow parallel slit 11 extending from the hole l() out through the inner face of the thickened portion 9, a central web l2 connecting the hub 6 with the riin 7 and having a counterbalanced portion 13 merging into the rim 7 opposite the slot S, an opening 14 adjacent the rim 7 and into which the slot S enters and an off-center bearing 15 intermediate the hub for the shaft of the automatic take-up mechanisin c, as shown in Figs. 2, 3 and el.

l rl`he automatic take-up mechanism c consists of a shaft 16 supported in the bearing 15, a U-shaped member 17 lia-ving the arms 18 18, the free ends of which are secured to the shaft 16 at each side of the bearing 15, and the cross bar 19 which extends transversely through the opening Li in the web 12 and has a longitudinal tubular hole 20. and a narrow parallel slit 21 extending from the hole 2O out through that side of the b ar adj acent the rim 7, a ratchet gear 22 secured to the shaft 16, a pawl 23 pivotallv secured to the central web 12 in a position to engage with the ratchet gear '22, a coiled spring 2-1 connected with a pawl 23 and with a stud '25 on the web 12, and a coiled spring 26 connected with the with the stud 25, as shown in Figs. 3 ant el.

The abrasive material d consists of a strip an abrasive substance, suc or coruiiduin, and having the beaded ends '2.7 and 28 formed by clamping a strip o of metal on itself, as shown in Fig. o

ln the modified form, as

U-sh aped member 1T and of paper or cloth covered on one surface with h as sand, einery thin metal over the ends and then folding the strip shown in Fig. 5,

ay indicates a shaft, b a i the U-shaped member 17 has an oppositelydisposed Weightedarm 29 Which is thrown dj acent portion of the strip extending under the thickened out through the slot 8, pawl 23 1s released from the ratchet gear 22,

28 is pushed edgewise through the slot 8, the beaded end 28 of the strip pushed into the hole 20 in the U-shaped member 17 with the adjacent portion of the strip extending out through the slit 21 and the strip wrapped around the peripheral face of the Wheel. The member 17 of the take-up mechanism is now released when, through the tension of the coiled spring 26, the member 17 is drawn to- Ward the stud 25 and the strip of abrasive material is drawn tightly around the peripheral face of the Wheel.

When in use the Wheel t is revolved at a high-rate of speed in the direction of the arrow, as shown in Fig. 2. The strip of abra sive material d coming into contact with the Work causes the strip to stretch lengthwise in the op osite direction to that in which the Whee revolves; thereby forcing the lengthened portion of the strip toward and through the slot 8. The centrifugal force of the' revolving 'Wheel acts on the take-up mechanism `.et9fn 1pve the U-shaped memberx 17 vfrom th W lines in Fig. 2, toward the full lines, thereby moving the member 17 in an o posite direction to that in which the Whee is revolving and the strip l partlyrotates the ratchet gear 22, and the pawl 23 enaging with the ratchet gear holds the member. 17 from a retrograde movement, as it continuously takes up the slack of the strip of abrasive material. The strip of abrasive material may also be tightened vby hand When the Wheel is at rest by pushing the member 17 of the take-up mechanism toward the stud 25, When it is held by the ratchet gear 22 andpawl23.

l Having thus described claim as newfand desire to Patent 1. In a grinding or 4olishing Wheel, a strip of abrasive or. olis 'ng material on the peripheral face o the Wheel, a take-up mechanism actuated by centrifugal force and operati vel With the strip of abramy invention, I secure by Letters connected sive' or po Shing material, and means in the inner face ofthe portion 9,

a coiled, spring 24 connected With the the strip of abrasive or pohshing material, and automatic means in the take-up mechamsm for automatically holding the same from a retrograde movement.

to the opposite end of In a grinding or polishing Wheel, l

of abrasive or polishing material on the eripheral face of the Wheel .and detachallily end of theholding the same from a retrograde movement.

4. In a grinding or combination of the following Instrumentalities, a Wheel I) having a hubv 6, an annular rim 7 in the face of Which is a transverse slot 8, a thickened portion 9 at one ledge of the having a hole 10 and a slit 11 extending from the hole l0 out through the a. central web 12 having a counterbalanced portion 13, an opening 14, and an off-center bearing 15, an automatic take-up mechanism c consisting of a shaft 16, a U-shaped member 17 having the arms 18 18 and the cross bar 19 in which is a hole 2O and a slit 2l extending from the hole out, a ratchet gear 22 secured to the shaft 16, a pawl 23pivotally secured t0 the Web 12 in a position to engage with the ratchet gear 22, pawl 23 and with 'a stud 25 on the yweb 12, a coiled spring 26 connected With the member 17 and polishing Wheel, the

d having 27 and 28, as described.

5. In, a grinding or. polishing Wheel, the combination of the following instrumentalities, a shaft a, a Wheel b having a hub 6, an annular rim 7 in the face of which is a transverse slot 8, 'a thickened portion 9 at one edge of the slot and having a hole 10 and a slit'll extending from the hole 10 out through the inner face of the portion 9, a central web 12 having a counterbalanced portion 13, an opening 14 and an off-center earing 15, an automatic take-u c consisting of a shaft 16, in the U-shaped member 17 having the arms 18 18 secured to the shaft 16-and the cross bar 19 1n Which is a hole 20. and a slit 21 extending from the hole out, a ratchet gear 22 secured to the shaft 16, a jewel 23 pivotally secured to the Web 12 in av position to engage with and a strip of abrasive or' the beaded ends ioo earing 15, a

the ratchet gear 22 a coiled spring 24 oon- In testimony whereof l have signed my neoted With the paWl 23 and With a stud 25 name to this speoiiieation in the presence of 10 on the Web 12, a coiled spring 26 oonneettwo subscribing Witnesses.

ed the membef and the Stud 257 A W a strip of abrasive or -'polishing material d Witnesses: having the beaded ends 27v and 28, as de- ADA E. HAGERTY, scribed. J. A. MILLER. 

